Hi Swagg, your ladies are looking mighty fine.
Don't worry about mistakes on a first grow cause as Krypto said, the first one is always an experiment. I would definitely recommend doing one strain at a time in the future as nute, light, temp, and height requirements are different for every strain.
I am glad you decided to scrog because it will increase your yield and help you to maintain an even canopy. To close the height difference i would scrog for about a week longer, then flip to 12/12. The sativa will continue to stretch for 2-4 weeks after the flip, while the indica will only stretch for about 1-2 weeks. So after the flip continue to scrog the sativa for at least another 2-3 weeks, scrog the indica for about a week (maybe two depending on the height of both plants) and then just let it grow...that way, with some tweaking and customizing on your part, the canopies will be even and you will have many, many bud sites.
As for trimming, it is beneficial to the plant as long as you don't over do it. If you see that a big fan leaf is blocking direct light to a few bud sites, don't be afraid to trim it, but dont give it a buzz cut.
Once you are a few weeks into flower and the stretch has stopped, it is important to trim very liberally under the screen, that way the plant isn't wasting precious time, energy, and resources on excess leaves and stems and directs them to the canopy where the buds are being produced.
This is a pic from another thread (by profgrow) which shows what i mean.
If i were you, i would go with a carbon filter vs an ozone generator. Ozone is toxic to humans and animals, so be careful if you do use it.
Other than that, it looks like you are handling everything pretty well. As the others in this thread have stated, stick to a simple nute schedule...all the expensive additives are just flash in the pan IMO.
Good luck with your grow and ill be following along. Post a link to your grow journal here if you start one, id love to pull up a seat.
Chadster152